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首页> 外文期刊>Journal of Experimental and Theoretical Physics >Angular pattern of electron diffraction by reflection in the plasmon channel of energy losses
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Angular pattern of electron diffraction by reflection in the plasmon channel of energy losses

机译：在能量损失的等离激元通道中通过反射进行电子衍射的角度模式

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摘要

We have constructed a theory for the excitation of plasmons by a fast charged particle that undergoes diffraction in a single crystal and then is scattered elastically and incoherently through a large angle. The theory allows the 30-year-old experimental results that have seemed strange to be explained. An increase in the diffraction contrast in the channel of inelastic electron scattering related to the excitation of a bulk plasmon compared to the diffraction contrast of elastically and incoherently reflected electrons was observed in these experiments. Based on this theory, we show that the excitation of a surface plasmon affects only slightly the angular diffraction pattern, leaving it almost the same as that for elastically reflected electrons. These peculiarities of elastic and inelastic diffraction can be used to identify the type of energy plasma loss.
机译：我们已经建立了一种由快速充电的粒子激发等离子体激元的理论，该粒子在单晶中经历衍射，然后以较大角度弹性和非相干地散射。该理论可以解释30年来似乎很奇怪的实验结果。在这些实验中，与弹性和非相干反射电子的衍射对比度相比，与体等离子体激元的激发有关的非弹性电子散射通道中的衍射对比度增加了。基于该理论，我们表明表面等离子体激元的激发仅对角衍射图样产生很小的影响，使其与弹性反射电子几乎相同。弹性和非弹性衍射的这些特性可用于识别能量等离子体损失的类型。

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